23. Freddy Adu
Career Years: 2004-Present
Career Lowlight: Returns to MLS with his tail between his legs in 2011.
Some called Adu "the next Pele" when he became a national sensation in 2004. In April of that year at age 14, he made his MLS debut with DC United and instantly became one of the most talked-about athletes in the country, if not the entire world. After leaving MLS in 2007, Adu has played for numerous teams abroad, but has yet to live up to the promise he showed at such a young age. While he played well in the 2011 CONCACAF Gold Cup with the senior US National Team, he has nevertheless become the poster child for the overhyped young player.